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Office 365 Mail Setup


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  • WHMCS Support Manager

Hi @J666GAK,

This error typically occurs if the Client ID and Client Secret don't match those configured in your Azure app within the Microsoft Entra control panel.

The design of Microsoft's Entra control panel can make it a little tricky to find the correct values, so this guide should help: https://help.whmcs.com/m/troubleshooting/l/1614110-connection-unsuccessful-please-close-this-window-and-try-again-with-microsoft

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